G-577 Throat Seal Liquid is a lubricant and a protectant to help keep your equipment in top performing condition. It is used in the wet cups of the transfer pumps to lubricate the pump shaft and keep contaminants from interfering with the efficiency of the pump packing. Part number G-577 is a 32oz. bottle. Lily also offers the Throat Seal Liquid in an 8oz. bottle. This part number is G-576.